The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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Employee Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, estimated amortization of net loss in next fiscal year	$ 1.5
Defined benefit plan, estimated future employer contribution in next fiscal year	2.0
Defined benefit plan, plan assets at fair value, valuation techniques and inputs	The fair value of plan assets was determined based on publicly quoted market prices for identical assets, which are classified as Level 1 observable inputs.
Defined benefit plan, significant concentrations of risk	Concentrations of risk within our equity portfolio are investments classified within the following sectors: technology, industrial, financial services, consumer cyclical goods and healthcare, which represents approximately 19%, 12%, 14%, 13% and 13% of total equity investments, respectively.
Defined contribution plan, compensation expense	$ 3.3	$ 0.9	$ 0.9
Equity Securities, Industry [Member] \| Technology Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, significant concentrations of risk	.19
Equity Securities, Industry [Member] \| Industrial Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, significant concentrations of risk	.12
Equity Securities, Industry [Member] \| Financial Services Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, significant concentrations of risk	.14
Equity Securities, Industry [Member] \| Consumer Cyclical Goods Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, significant concentrations of risk	.13
Equity Securities, Industry [Member] \| Healthcare Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, significant concentrations of risk	.13
Supplemental Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of retirement plans	2
Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, long-term rate of return on assets	8.00%	8.00%	8.00%